Galvanic cell without liquid junction for potentiometric determination of copper |
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Authors: | Migdalski Jan Błaz Teresa Zrałka Barbara Lewenstam Andrzej |
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Institution: | a Faculty of Material Science and Ceramics, AGH-University of Science and Technology, PL-30059 Krakow, Poland b Center for Process Analytical Chemistry and Sensor Technology (ProSens), c/o Process Chemistry Center of Excellence, Åbo Akademi University, FIN-20500 Turku-Åbo, Finland |
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Abstract: | This paper describes potentiometric measurements in an integrated galvanic cell with both indicator and reference electrodes. Both electrodes are conducting polymer-based. The copper-sensitive indicator electrode is made by using poly(3,4-ethylenedioxythiophene) (PEDOT) doped with 2-(o-arsenophenylazo)-1,8-dihydroxynaphthalene-3,6-disulphonic sodium salt (Arsenazo-I) as the electroactive substance in the film, while the reference electrode is based on PEDOT doped by 2-morpholineoethanesulfonic acid (MES). It is shown that the galvanic cell can be used for determination of copper both in non-aqueous media (where all PVC-based membranes failed) and in the presence of chloride ions, which disturb the signal of conventional copper ion-selective electrodes with solid-state membranes. It is further shown that the titration of copper ions can be successfully monitored using the described electrochemical cell. |
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Keywords: | Conducting polymers Metal complexing ligands Membrane potential Ion-selective electrode Junctionless reference electrode Potentiometric titration |
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